Hi there, Pippa has been making these giant clumps of hair behind her ears that are absolutely rock solid! We cannot pick them out with our fingers and trying to pull the brush through them is impossible!! We think this is caused when she scratches behind her ears and they just seem to be getting bigger!!! They are now about the size of iPod shuffles ( my apologies, I could not think of any thing the same size!) and the feels like it has been glued together! We have considered cutting these clumps out with scissors but it may look a bit odd if there are chunks missing out of her fur under her ears! If anyone has experienced this before, please comment! Thanks, Eve and most importantly, Pippa (the sheltie)!